Mouthguard



FIG. 1 is a front view of a mouthguard showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof, the right side view being a mirror image thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a perspective view thereof. 

CLAIM The ornamental design for a mouthguard, as shown and described. 